Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Joseph L. Ganey; Gary C. White; James P. Ward; Sean C. KyleDarrell L. ApprillTodd A. Rawlinson; Ryan S. Jonnes
    Date: 2014
    Source: Journal of Wildlife Management. 78(1): 42-49.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (270.03 KB)

    Description

    Information on population dynamics is key to gauging the status of threatened or endangered species. We monitored demography of a population of threatened Mexican spotted owls (Strix occidentalis lucida) in the Sacramento Mountains, New Mexico from 2003 to 2011. We estimated reproductive output for territorial pairs of owls; used mark-recapture methodology and Pradel's reparameterized Jolly-Seber models to estimate annual apparent survival rates, recapture rates, recruitment rates, and annual rate of population change (lRJS) for 2005-2009; and used estimates of lRJS to assess short-term population viability. Reproductive output was highly variable for 2004­2011, whereas annual apparent survival and recapture rates were less variable among years. Annual rates of population change exceeded 1.0 for both sexes from 2005 to 2009, and empirical observations of numbers of territorial owls supported the model-based trend estimate. Abundance of territorial owls was strongly related to reproduction within the study area, suggesting that population change was driven largely by internal processes. Population viability analyses suggested that population growth was likely to continue in the short term if current conditions persist. The positive growth rates observed in our study populations are encouraging, and may indicate that current recommendations for recovering this owl are succeeding. However, our estimates of lRJS covered a very short time period, given both the potential lifespan of Mexican spotted owls and the extent of temporal variability in weather typical of the southwestern United States. Longer studies of owl demography than we present will be required to understand long-term population trends, and such studies should extend across the range of the subspecies. Published 2013. This article is a U.S. Government work and is in the public domain in the USA.

    Publication Notes

    • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Ganey, Joseph L.; White, Gary C.; Ward, James P., Jr.; Kyle, Sean C.; Apprill, Darrell L.; Rawlinson, Todd A.; Jonnes, Ryan S. 2014. Demography of Mexican spotted owls in the Sacramento Mountains, New Mexico. Journal of Wildlife Management. 78(1): 42-49.

    Cited

    Google Scholar

    Keywords

    demography, fecundity, Mexican spotted owl, population trend, population viability, Pradel model, recruitment, reparameterized Jolly-Seber model, survival, vital rates

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page